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Synthesis of organosoluble copolyimide and preparation of fibers by dry-spinning process on a large scale.
- Source :
-
High Performance Polymers . Dec2018, Vol. 30 Issue 10, p1193-1202. 10p. - Publication Year :
- 2018
-
Abstract
- An organosoluble copolyimide (co-PI) was synthesized from 3,3′,4,4′-benzophenonetetracarboxylic dianhydride (BTDA), 1,4-bis-(4-aimino-2-triflupromethyl-phenoxy)-benzene (p-6FAPB), and 2-(4-aminophenyl)-5-aminobenzimidazole (BIA) via the one-step polymerization using N-methyl-2-pyrrolidone (NMP) as the solvent, and high-performance co-PI fibers were directly prepared by the dry-spinning process on a large scale. Scanning electron microscopic images show that all formulations of as-spun fibers exhibit elliptical cross sections as well as dense morphologies. The structural evolution of the co-PI fiber induced by the high rolling speed and post-heat-drawing treatment was studied by means of thermogravimetric analysis, dynamic thermomechanical analysis, and two-dimensional wide-angle X-ray diffraction (2D WAXD). With increasing rolling speeds, glass transition temperatures (Tgs) and thermal stabilities of as-spun fibers slightly decrease, which may be resulted from the disentanglement of entangled molecular chains under the large deformation and high-temperature heating atmosphere in the spinning column. 2D WAXD data indicate that both increasing rolling speeds and post-heat-drawing treatment are beneficial for getting a highly ordered structure along the meridian direction of the fibers. The fibers treated at 430°C exhibit outstanding mechanical properties, and the tensile strength and modulus reach 1.44 GPa and 48.69 GPa, respectively, at a drawing ratio of 2.8. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09540083
- Volume :
- 30
- Issue :
- 10
- Database :
- Academic Search Index
- Journal :
- High Performance Polymers
- Publication Type :
- Academic Journal
- Accession number :
- 133291982
- Full Text :
- https://doi.org/10.1177/0954008317744868